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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

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<li class="item"></li>
<li></li>
<li></li>


<script>

    // -- Two
    (function () {


        window.jQuery = jQuery;
        window.$ = window.jQuery;

        // -- one
        function jQuery(selector) {

            return jQuery.prototype.init(selector);

        }

        // -- Three
        jQuery.prototype.init = function (selector, content) {

            var oDom = document.getElementsByTagName(selector);

            for (var i = 0; i < oDom.length; i++) {

                this[i] = oDom[i];
            }

            return this;
        }

        // -- four
        jQuery.prototype.css = function () {
            document.write('12121212');

        }

        // -- five
        jQuery.prototype.init.prototype = jQuery.prototype;


    })()


    $('li').css();

</script>


</body>
</html>